3 * Copyright (c) 2014, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
18 #include <linux/device.h>
19 #include <linux/platform_device.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/hid-sensor-hub.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/sysfs.h>
28 #include <linux/iio/buffer.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
31 #include "../common/hid-sensors/hid-sensor-trigger.h"
33 #define CHANNEL_SCAN_INDEX_PRESENCE 0
36 struct hid_sensor_hub_callbacks callbacks
;
37 struct hid_sensor_common common_attributes
;
38 struct hid_sensor_hub_attribute_info prox_attr
;
42 /* Channel definitions */
43 static const struct iio_chan_spec prox_channels
[] = {
45 .type
= IIO_PROXIMITY
,
47 .channel2
= IIO_NO_MOD
,
48 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
49 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_OFFSET
) |
50 BIT(IIO_CHAN_INFO_SCALE
) |
51 BIT(IIO_CHAN_INFO_SAMP_FREQ
) |
52 BIT(IIO_CHAN_INFO_HYSTERESIS
),
53 .scan_index
= CHANNEL_SCAN_INDEX_PRESENCE
,
57 /* Adjust channel real bits based on report descriptor */
58 static void prox_adjust_channel_bit_mask(struct iio_chan_spec
*channels
,
59 int channel
, int size
)
61 channels
[channel
].scan_type
.sign
= 's';
62 /* Real storage bits will change based on the report desc. */
63 channels
[channel
].scan_type
.realbits
= size
* 8;
64 /* Maximum size of a sample to capture is u32 */
65 channels
[channel
].scan_type
.storagebits
= sizeof(u32
) * 8;
68 /* Channel read_raw handler */
69 static int prox_read_raw(struct iio_dev
*indio_dev
,
70 struct iio_chan_spec
const *chan
,
74 struct prox_state
*prox_state
= iio_priv(indio_dev
);
82 case IIO_CHAN_INFO_RAW
:
83 switch (chan
->scan_index
) {
84 case CHANNEL_SCAN_INDEX_PRESENCE
:
85 report_id
= prox_state
->prox_attr
.report_id
;
87 HID_USAGE_SENSOR_HUMAN_PRESENCE
;
94 hid_sensor_power_state(&prox_state
->common_attributes
,
96 *val
= sensor_hub_input_attr_get_raw_value(
97 prox_state
->common_attributes
.hsdev
,
98 HID_USAGE_SENSOR_PROX
, address
,
101 hid_sensor_power_state(&prox_state
->common_attributes
,
107 ret_type
= IIO_VAL_INT
;
109 case IIO_CHAN_INFO_SCALE
:
110 *val
= prox_state
->prox_attr
.units
;
111 ret_type
= IIO_VAL_INT
;
113 case IIO_CHAN_INFO_OFFSET
:
114 *val
= hid_sensor_convert_exponent(
115 prox_state
->prox_attr
.unit_expo
);
116 ret_type
= IIO_VAL_INT
;
118 case IIO_CHAN_INFO_SAMP_FREQ
:
119 ret_type
= hid_sensor_read_samp_freq_value(
120 &prox_state
->common_attributes
, val
, val2
);
122 case IIO_CHAN_INFO_HYSTERESIS
:
123 ret_type
= hid_sensor_read_raw_hyst_value(
124 &prox_state
->common_attributes
, val
, val2
);
134 /* Channel write_raw handler */
135 static int prox_write_raw(struct iio_dev
*indio_dev
,
136 struct iio_chan_spec
const *chan
,
141 struct prox_state
*prox_state
= iio_priv(indio_dev
);
145 case IIO_CHAN_INFO_SAMP_FREQ
:
146 ret
= hid_sensor_write_samp_freq_value(
147 &prox_state
->common_attributes
, val
, val2
);
149 case IIO_CHAN_INFO_HYSTERESIS
:
150 ret
= hid_sensor_write_raw_hyst_value(
151 &prox_state
->common_attributes
, val
, val2
);
160 static const struct iio_info prox_info
= {
161 .driver_module
= THIS_MODULE
,
162 .read_raw
= &prox_read_raw
,
163 .write_raw
= &prox_write_raw
,
166 /* Function to push data to buffer */
167 static void hid_sensor_push_data(struct iio_dev
*indio_dev
, const void *data
,
170 dev_dbg(&indio_dev
->dev
, "hid_sensor_push_data\n");
171 iio_push_to_buffers(indio_dev
, data
);
174 /* Callback handler to send event after all samples are received and captured */
175 static int prox_proc_event(struct hid_sensor_hub_device
*hsdev
,
179 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
180 struct prox_state
*prox_state
= iio_priv(indio_dev
);
182 dev_dbg(&indio_dev
->dev
, "prox_proc_event\n");
183 if (atomic_read(&prox_state
->common_attributes
.data_ready
))
184 hid_sensor_push_data(indio_dev
,
185 &prox_state
->human_presence
,
186 sizeof(prox_state
->human_presence
));
191 /* Capture samples in local storage */
192 static int prox_capture_sample(struct hid_sensor_hub_device
*hsdev
,
194 size_t raw_len
, char *raw_data
,
197 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
198 struct prox_state
*prox_state
= iio_priv(indio_dev
);
202 case HID_USAGE_SENSOR_HUMAN_PRESENCE
:
203 prox_state
->human_presence
= *(u32
*)raw_data
;
213 /* Parse report which is specific to an usage id*/
214 static int prox_parse_report(struct platform_device
*pdev
,
215 struct hid_sensor_hub_device
*hsdev
,
216 struct iio_chan_spec
*channels
,
218 struct prox_state
*st
)
222 ret
= sensor_hub_input_get_attribute_info(hsdev
, HID_INPUT_REPORT
,
224 HID_USAGE_SENSOR_HUMAN_PRESENCE
,
228 prox_adjust_channel_bit_mask(channels
, CHANNEL_SCAN_INDEX_PRESENCE
,
231 dev_dbg(&pdev
->dev
, "prox %x:%x\n", st
->prox_attr
.index
,
232 st
->prox_attr
.report_id
);
234 /* Set Sensitivity field ids, when there is no individual modifier */
235 if (st
->common_attributes
.sensitivity
.index
< 0) {
236 sensor_hub_input_get_attribute_info(hsdev
,
237 HID_FEATURE_REPORT
, usage_id
,
238 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS
|
239 HID_USAGE_SENSOR_DATA_PRESENCE
,
240 &st
->common_attributes
.sensitivity
);
241 dev_dbg(&pdev
->dev
, "Sensitivity index:report %d:%d\n",
242 st
->common_attributes
.sensitivity
.index
,
243 st
->common_attributes
.sensitivity
.report_id
);
248 /* Function to initialize the processing for usage id */
249 static int hid_prox_probe(struct platform_device
*pdev
)
252 static const char *name
= "prox";
253 struct iio_dev
*indio_dev
;
254 struct prox_state
*prox_state
;
255 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
256 struct iio_chan_spec
*channels
;
258 indio_dev
= devm_iio_device_alloc(&pdev
->dev
,
259 sizeof(struct prox_state
));
262 platform_set_drvdata(pdev
, indio_dev
);
264 prox_state
= iio_priv(indio_dev
);
265 prox_state
->common_attributes
.hsdev
= hsdev
;
266 prox_state
->common_attributes
.pdev
= pdev
;
268 ret
= hid_sensor_parse_common_attributes(hsdev
, HID_USAGE_SENSOR_PROX
,
269 &prox_state
->common_attributes
);
271 dev_err(&pdev
->dev
, "failed to setup common attributes\n");
275 channels
= kmemdup(prox_channels
, sizeof(prox_channels
), GFP_KERNEL
);
277 dev_err(&pdev
->dev
, "failed to duplicate channels\n");
281 ret
= prox_parse_report(pdev
, hsdev
, channels
,
282 HID_USAGE_SENSOR_PROX
, prox_state
);
284 dev_err(&pdev
->dev
, "failed to setup attributes\n");
285 goto error_free_dev_mem
;
288 indio_dev
->channels
= channels
;
289 indio_dev
->num_channels
=
290 ARRAY_SIZE(prox_channels
);
291 indio_dev
->dev
.parent
= &pdev
->dev
;
292 indio_dev
->info
= &prox_info
;
293 indio_dev
->name
= name
;
294 indio_dev
->modes
= INDIO_DIRECT_MODE
;
296 ret
= iio_triggered_buffer_setup(indio_dev
, &iio_pollfunc_store_time
,
299 dev_err(&pdev
->dev
, "failed to initialize trigger buffer\n");
300 goto error_free_dev_mem
;
302 atomic_set(&prox_state
->common_attributes
.data_ready
, 0);
303 ret
= hid_sensor_setup_trigger(indio_dev
, name
,
304 &prox_state
->common_attributes
);
306 dev_err(&pdev
->dev
, "trigger setup failed\n");
307 goto error_unreg_buffer_funcs
;
310 ret
= iio_device_register(indio_dev
);
312 dev_err(&pdev
->dev
, "device register failed\n");
313 goto error_remove_trigger
;
316 prox_state
->callbacks
.send_event
= prox_proc_event
;
317 prox_state
->callbacks
.capture_sample
= prox_capture_sample
;
318 prox_state
->callbacks
.pdev
= pdev
;
319 ret
= sensor_hub_register_callback(hsdev
, HID_USAGE_SENSOR_PROX
,
320 &prox_state
->callbacks
);
322 dev_err(&pdev
->dev
, "callback reg failed\n");
323 goto error_iio_unreg
;
329 iio_device_unregister(indio_dev
);
330 error_remove_trigger
:
331 hid_sensor_remove_trigger(&prox_state
->common_attributes
);
332 error_unreg_buffer_funcs
:
333 iio_triggered_buffer_cleanup(indio_dev
);
335 kfree(indio_dev
->channels
);
339 /* Function to deinitialize the processing for usage id */
340 static int hid_prox_remove(struct platform_device
*pdev
)
342 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
343 struct iio_dev
*indio_dev
= platform_get_drvdata(pdev
);
344 struct prox_state
*prox_state
= iio_priv(indio_dev
);
346 sensor_hub_remove_callback(hsdev
, HID_USAGE_SENSOR_PROX
);
347 iio_device_unregister(indio_dev
);
348 hid_sensor_remove_trigger(&prox_state
->common_attributes
);
349 iio_triggered_buffer_cleanup(indio_dev
);
350 kfree(indio_dev
->channels
);
355 static struct platform_device_id hid_prox_ids
[] = {
357 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
358 .name
= "HID-SENSOR-200011",
362 MODULE_DEVICE_TABLE(platform
, hid_prox_ids
);
364 static struct platform_driver hid_prox_platform_driver
= {
365 .id_table
= hid_prox_ids
,
367 .name
= KBUILD_MODNAME
,
368 .pm
= &hid_sensor_pm_ops
,
370 .probe
= hid_prox_probe
,
371 .remove
= hid_prox_remove
,
373 module_platform_driver(hid_prox_platform_driver
);
375 MODULE_DESCRIPTION("HID Sensor Proximity");
376 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
377 MODULE_LICENSE("GPL");